Patent GB-1026512-A (GB)
Title: Connector for reinforced flexible tubes
Inventor: CHEVALIER ANDRE
IPC: F16L25/01
Filed: 1963-03-01
Abstract: 1,026,512. Tube joints. INSTITUT FRANCAIS DU PETROLE, DES CARBURANTS ET LUBRIFIANTS. March 1, 1963 [March 1, 1962], No. 8388/63. Heading F2G. A unit for connecting flexible tubes having a hollow core 1, Fig. 1, and at least one reinforcement of metal wires comprises a hollow insert 20 having at one end means for joining the insert to a similar insert, a clamping sleeve 8 having one part 9, of constant inner diameter, for disposition between the core and wires and another part 11 for compressing the core against the insert and adapted to be connected to the latter, and a locking sleeve 7 for locking the bent-over extremities of the wires in a circular cavity formed by the engagement of the locking sleeve and clamping sleeve. A clamping sleeve 8, Fig. 5, has a part 9b which is placed between the core of the tube and the wire reinforcement 3, 4 and a sleeve 7b is screwed on the clamping device which is shaped so that annular cavities 59, 60 house the bent-over ends of the wires, these cavities being filled with liquid which solidifies, e.g. alloy or resin, and an insert 21b is forced into the core, the insert having an outer conical portion 20b which comprises the end 56 of the core, the gap between the core and clamping sleeve 8 being filled with solidifiable liquid 57. The insert 21b is enlarged at 63, 64 to grip the core. A metal tube, concentric with the insert 21b, may be added between the clamping sleeve 8 and the core and gives corresponding local reductions in diameter. Fig. 1 shows a method of connecting tube sections in which the core 1 has embedded in it electrical conductors 2 and wire reinforcement 3, 4 and is covered by a protective sheath 5. A socket 6 and sleeve 7 are first threaded over the tube and the sheath 5 is then stripped back. A clamping sleeve 8 is then fitted by pushing the cylindrical extension 9 thereof between the core 1 and the reinforcement 3, 4 and screwing on to the body 11 of the clamping sleeve, at the threads 17, a locking sleeve 7. The reinforcement 3, 4 is bent back at S and the cavity between the extension 9 and the sleeve 7, in which the bent ends are accommodated, is filled with solidifiable liquid. Cavities are formed in the sleeve 7 in which the liquid solidifies into locking keys. From the bore in the body of the sleeve 8 extends a conical opening into which the end of the core 1 fits whereby, when the conical end 21 of an insert 20 is forced into the core, this is pressed against the wall of the opening, a step 12 assisting in the gripping action. The insert 21 has locking grooves 26 and is screw-threaded for a retaining nut 24. Covering sleeves 43, 43a are screwed, at 44, 45 on the clamping sleeves 8, 8a; half-sleeves 48, 49 are fitted over them, these half-sleeves having dowels 50, 50a, 51, 51a which fit into recesses in the locking sleeves 7, 7a; an outer sleeve 42 is slid over the half sleeves and the assembly is held together by screwing caps 6, 6a on the locking sleeves 7, 7a and against the ends of the sleeve 42. When the two parts of the connector unit have been assembled and the electrical connections have been made, insulating material is poured into the cavities 14, 14a through openings 46, 46a to embed the ends of the conductors and their connections. Where, in an arrangement similar to that shown in Fig. 5, the tube case has electrical conductors, cavities similar to 14, 14a are provided for a similar purpose, and are sealed against infiltrations of liquid between the core and tube by resilient sealing rings comprising orifices for each conductor in an insulating sheath, backed by a metal ring, also with orifices, whence they pass through an annular space to the cavities, this annular space being filled with a hardenable alloy or resin.